Pipes and Cistern

The first two of the three pipes can fill an empty tank in $10.8 \mathrm{hours}$ and $21.6 \mathrm{hours}$ respectively, while the third pipe can empty the filled tank in $18 \mathrm{hours}$. If the tank is empty and all three pipes are opened simultaneously, then in how many hours will the tank be filled?

$15 \mathrm{hours}$ of rain can fill $60\%$of a pond. A man can empty the pond in $50 \mathrm{hours}$. The pond was completely empty when it started raining. If it rained for $12 \mathrm{hours}$ , how much time will it take for the man to empty the Pond ?
 

Two machines fill a juice container. Machine B is $62.5\%$ as efficient as Machine A. If Machine A fills the tank completely in $2.5 \mathrm{hours}$, how much time will it take for both the machines to fill $65\%$ of the container ?
 

Two inlets A and B can fill an empty tank in $36 hours$ and $60 hours$ respectively. In how much time, will they together fill the $\frac{1}{6}\mathrm{th}$ part of the tank?

Two inlet pipes A and B and an outlet pipe, C, are connected to a tank. Find the time taken by pipe C alone to empty the full tank. To find the answer, which of the following information given in statements I and II is/are necessary?
Statement I: Pipe A and B together can fill the tank in $\frac{60}{7}$ minutes.
Statement II: Pipe A, B, and C together can fill the tank in $12$ minutes.

Direction - solve the question:

If Pipes A and B can fill a tank in $15$ min and $20$ mins respectively and pipe C empties the tank in $12$ mins. What will be the time taken by A, B and C together to fill the tank completely?

Then on two pipes $P$ and $Q$ can fill the tank in $20 hours$ and $40 hours$  respectively also Pipe $R$ is attached which can empty the tank in $120 hours$. if all pipes working together and at $2 pm$ and after $10 hours$ pipe $R$ is cleared when will the tank filled?

The ratio of efficiencies of two outlet pipes is $2:3$. There is a third filling pipe which efficiency is $\frac{8}{5}$ Of the average efficiency of two outlet pipes can fill an empty tank in $70$ Minutes. In how much time both the emptying pipe can empty the tank when it is completely filled?

Pipe P can fill a tank is $12$ hours & Pipe Q can empty tank is $18$ hours. Both pipe are opened at $6$ am and after some time Q is closed and the tank is full at $8$ pm on the same day. At what time was B closed?

Two pipes can fill a tank is $18$ minutes and $27$ minutes. A third pipe can empty the tank (where full) in $6$ mins. On the three pipes are opened when the tank was ${\frac{2}{3}}^{th}$ full. In how many minutes will the tank become empty?

Two pipes A & B can fill a tank in $8$ and $24$ hours respectively. there is an outlet exactly at ${\frac{2}{3}}^{th}$ of the height above the base which can empty the top one-third of the tank be full, in $4$ hours. In how many hours, will the empty tank be full, if both in e pipes and the outlet are opened simultaneously?

Two taps $\mathrm{X}$ and $\mathrm{Y}$ can fill a tank in $12$minutes and $15$minutes, respectively. If both the taps are opened simultaneously, and tap $\mathrm{X}$ is closed after $3$ minutes, then how much more time will it take to fill the tank with the help of tap $\mathrm{Y}$?

A tap can empty a tank in $36 \mathrm{hrs}$. After one-third of the tank is empty $4$ more similar taps are opened. What is the total time taken by the taps to empty the tank completely?

A pipe can fill a tank in $4$ hours. Due to a leakage it takes $5$ hours more time to fill it. If the tank is filled, in how many hours the tank will be emptied by $\frac{5}{6}$ th part of the tank?

Pipe A can fill a tank in $4$ hours and another pipe B can empty the same tank in $6$ hours. Pipe A is opened and after $3$ hours B is also opened. In how many hours, the tank will be filled?

A pipe can fill an empty tank in $5$ hours. After $\frac{3}{5}$ th part the tank is filled, another pipe of same efficiency is opened. In how many hours, the tank will be filled?

A tank has a pipe of diameter $k$ Which can fill it in $54 \mathrm{hrs}$. If this pipe is replaced by a pipe of diameter $3k$, Then time taken by this pipe to fill the tank is _____?

Two pipes A and B can fill an empty tank in $4$ hours and $3$ hours respectively. If they are opened alternatively and pipe B is opened first, then in how many hours the tank will be filled?

A water tank has three taps A, B and C. Tap A, when opened, can fill the water tank alone in $4 hours$. Tap B, when opened, can fill the water tank alone in $6 hours$ and tap C, when opened, can empty the water tank alone in $3 hours$. If taps A, B and C are opened simultaneously, how long will it take to fill the tank completely?

Pipe A fill the tank in \(2\) hours and Pipe B fill the same tank in \(90\) minutes. Pipe C empties the same filled tank in \(180\) minutes. If Pipe A and B open together at \(8:30\) am and Pipe C open at \(9:00\) am, then at what time tank filled?